Abutment assembly

Abstract

An abutment assembly is disclosed. The abutment assembly may comprise: an implant implanted in the alveolar bone and provided with a first inner groove on which a first inner circumferential surface screw part is formed; an abutment having a second inner groove formed on the center thereof, the second inner groove being provided with a second inner circumferential surface screw part, and inserted into the first inner groove to be coupled thereto; a lower connection part having a first through-hole formed through the center thereof, the first through-hole extending vertically, and coupled to the second inner groove; a crown having a second through-hole formed through the center thereof, the second through-hole extending vertically, and provided with a lower groove under the second through-hole, the lower connection part being coupled to the lower groove; and a holding screw inserted into the second through-hole to be coupled to the lower connection part and having a male screw part formed thereon to be fastened to the second inner circumferential surface screw part of the abutment.

Description

Abutment assembly

[0001] The present invention relates to an abutment assembly.

[0002] In general, an abutment assembly refers to an artificial substitute configured to reproduce the same form and function as a natural tooth, and is composed of an implant having screw threads formed on the outer surface and modeled after the root shape of a natural tooth to be installed in the alveolar bone, an abutment connected to and installed on top of the implant and having an artificial tooth attached thereto, and a fixing screw that fixes the implant and the abutment to each other.

[0003] There are three main methods for attaching an artificial tooth (crown) to an abutment: screw fastening, cement bonding, and a combination of screw fastening and cement bonding.

[0004] First, in the case of the screw fastening method, the prosthesis made as an integral part of the abutment is fastened to the implant implanted in the alveolar bone using a screw, but there is a disadvantage in that deformation may occur due to shrinkage during casting of the prosthesis.

[0005] In addition, the cement bonding method is a method in which the abutment is first attached to the implant, and then the prosthesis is bonded to the upper surface of the abutment with dental cement. However, the cement bonding method has the problem that it takes a lot of time to remove the cement exposed to the outside of the crown, and even if it is removed cleanly, the cement inside the crown can melt and leak into the patient's mouth, causing gingivitis and even implant loss. In addition, the hybrid fastening method that uses screw fastening and cement fastening also has the problem of screw loosening and gingivitis caused by the residual cement, so the cement bonding method is gradually being used less and less.

[0006] Meanwhile, an abutment assembly including a screw-fastened prosthesis is installed by forcing a connecting member into the prosthesis to join the abutment and the prosthesis. At this time, when the connecting member made of metal is forcibly pressed into the zirconia prosthesis and fixed, the connecting member may be deformed depending on the dimensions of the prosthesis, which may cause long-term stability problems.

[0007] Therefore, there is a need for an abutment assembly assembly system and assembly method that can firmly bond a connecting member to a prosthesis without deformation and enable a firm bonding of a crown and an abutment without using cement.

[0008] The present invention is intended to solve the problems of the prior art described above, and an object of the present invention is to provide an abutment assembly that can be accurately assembled to minimize deformation of the prosthesis and parts, and that enables a firm bonding of a crown and an abutment without using dental cement.

[0009] An abutment assembly according to one embodiment of the technical idea of ​​the present invention for achieving the above object may include: an implant that is implanted into an alveolar bone and has a first internal groove in which a first internal peripheral surface thread portion is formed; an abutment that has a second internal groove in which a second internal peripheral surface thread portion is formed in the center and is inserted into and engaged with the first internal groove; a lower connecting portion that has a first through hole extending vertically in the center and is engaged with the second internal groove; a crown that has a second through hole extending vertically in the center and is provided with a lower groove below the second through hole to which the lower connecting portion is engaged; and a holding screw that is inserted into the second through hole and is engaged with the lower connecting portion and has a male thread portion that is fastened to the second internal peripheral surface thread portion of the abutment.

[0010] In addition, the lower connecting portion may include a first anti-rotation portion inserted into a lower groove of the crown and a second anti-rotation portion inserted into a second internal groove of the abutment, the lower groove of the crown may include a circular engagement surface to which the first anti-rotation portion is engaged, a recess is formed on the engagement surface, the first anti-rotation portion may include a protrusion corresponding to the recess, a cross-section of the second anti-rotation portion may be formed in a polygonal shape, and the second internal groove may include a polygonal portion corresponding to the second anti-rotation portion.

[0011] Additionally, the first through hole of the lower connecting portion may be provided with a third inner peripheral threaded portion to which the male threaded portion of the holding screw can be fastened.

[0012] In addition, the second through hole of the crown may be provided with a step portion, and the holding screw may include a screw having a head formed at an upper portion and a male threaded portion formed at a lower portion that is fastened to the first inner peripheral screw portion, a support portion positioned at a lower portion of the head and supported by being hooked onto the step portion of the crown, and a holding portion including a lower coupling portion that extends from a lower portion of the support portion and is coupled to the first through hole of the lower connecting portion.

[0013] Additionally, the screw and the holding portion can be formed integrally.

[0014] In addition, the inner surface of the support member may be provided with a fourth inner surface screw portion to which the male screw portion of the holding screw can be fastened, so that the holding member can be fastened to the screw.

[0015] In addition, the lower connecting portion includes a connecting piece that is elastically deformable in the radial direction and is divided by a cut groove, a catch projection is formed on an outer surface of the connecting piece, an inner vertical portion having a constant inner diameter is formed in the first through hole of the lower connecting portion, and a boring portion provided below the inner vertical portion and to which the catch projection is engaged is formed, and the connecting piece can be elastically engaged to the inner peripheral surface of the first through hole by contracting radially inwardly while passing through the inner vertical portion and expanding radially outwardly in the boring portion.

[0016] In addition, the lower connecting portion is formed with a circular cross-section, and the lower connecting portion can be inserted into the first through hole of the lower connecting portion so that the outer surface thereof can be in close contact with the inner surface of the first through hole.

[0017] According to the abutment assembly according to the present invention, there is an advantage in that it can be assembled quickly and accurately to minimize deformation of the prosthesis and parts without dental cement, thereby ensuring long-term stability, and there is an advantage in that inflammation caused by dental cement can be eliminated.

[0018] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0019] FIG. 1 is a perspective view of an abutment assembly according to one embodiment of the present invention.

[0020] Figure 2 is an exploded view of an abutment assembly according to one embodiment of the present invention.

[0021] Figure 3 is a cross-sectional view of an abutment assembly according to one embodiment of the present invention.

[0022] Figures 4 (a) and (b) are a perspective view and a cross-sectional view, respectively, of an implant during an abutment assembly.

[0023] Figures 5 (a) and (b) are a perspective view and a cross-sectional view, respectively, of an abutment during an abutment assembly.

[0024] Figures 6 (a) to (c) are a perspective view, a plan view, and a cross-sectional view, respectively, of the lower connecting portion of the abutment assembly.

[0025] Figures 7 (a) to (c) are a perspective view, a plan view, and a cross-sectional view, respectively, of a crown in an abutment assembly.

[0026] Figures 8 (a) to (c) are perspective views and cross-sectional views, respectively, of a holding screw in an abutment assembly.

[0027] Figure 9 is an exploded perspective view of an abutment assembly assembly system according to one embodiment of the present invention.

[0028] Figures 10 and 11 are drawings showing a process of assembling a prosthesis assembly using an abutment assembly assembly system.

[0029] Figure 12 is a drawing showing the process of assembling a prosthesis assembly to an abutment connected to an implant.

[0030] In order to fully understand the present invention, its operational advantages, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the drawings, which illustrate preferred embodiments of the present invention.

[0031] Hereinafter, the present invention will be described in detail by describing preferred embodiments thereof with reference to the attached drawings. The same reference numerals in each drawing represent the same components.

[0032] FIG. 1 is a perspective view of an abutment assembly according to one embodiment of the present invention, FIG. 2 is an exploded view of an abutment assembly according to one embodiment of the present invention, and FIG. 3 is a cross-sectional view of an abutment assembly according to one embodiment of the present invention.

[0033] Referring to FIGS. 1 to 3, the abutment assembly (1000) includes an implant (100), an abutment (200), a lower connecting portion (300), a crown (400), and a holding screw (HS).

[0034] Figures 4 (a) and (b) are a perspective view and a cross-sectional view, respectively, of an implant during an abutment assembly.

[0035] Referring to FIGS. 2, 3, and 4, the implant (100) is formed to have the root shape of a natural tooth to function as a root. In addition, a first internal groove (110) is formed in the center of the implant (100), a first internal peripheral screw portion (120) is installed below the first internal groove (110), and a second external peripheral screw portion (220) of an abutment (200) is coupled to the first internal peripheral screw portion (120). A first external peripheral screw portion (130) is formed on the outer peripheral surface of the implant (100), and the implant (100) is inserted and coupled into the inner side of the alveolar bone.

[0036] Figures 5 (a) and (b) are a perspective view and a cross-sectional view, respectively, of an abutment during an abutment assembly.

[0037] Referring to FIGS. 2, 3 and 5, the abutment (200) is coupled to the implant (100) to support the lower connecting portion (300) and the crown (400), and a second internal groove (240) is formed on the upper surface so that the lower connecting portion (300) can be coupled.

[0038] In addition, the abutment (200) is configured to include a lower portion (210), a second outer peripheral screw portion (220), and an upper portion (230).

[0039] The lower portion (210) is inserted into the first inner groove (110) of the implant (100), and the outer circumference of the lower portion (210) may be formed in a tapered shape in which the diameter gradually narrows toward the bottom. In addition, the lower surface of the crown (400) may be supported on the upper surface (211) of the lower portion (210).

[0040] The second outer peripheral screw portion (220) is formed to extend below the lower portion (210), and the outer peripheral surface is provided with screw threads that are fastened to the first inner peripheral screw portion (120) of the implant (100).

[0041] The upper portion (230) protrudes from the upper portion of the lower portion (210) to the outside of the implant (100). The upper portion (230) has a circular cross-section and can be formed into a pyramid shape with an outer diameter that narrows as it goes upward.

[0042] The second inner groove (240) of the abutment (200) may include an inner inclined portion (241), a polygonal portion (242), and a second inner peripheral screw portion (243).

[0043] More specifically, the second inner groove (240) of the abutment (200) has an inner inclined portion (241) that has a circular cross-section and an inner diameter that becomes narrower as it goes downward from the upper surface entrance to a certain depth below, a polygonal portion (242) that has a polygonal cross-section to a certain depth below the inner inclined portion (241) and to which a lower connecting portion (300) is connected, and a second inner peripheral thread portion (243) is installed below the polygonal portion (242), and a screw (600) is fastened to the second inner peripheral thread portion (243).

[0044] Figures 6 (a) to (c) are a perspective view, a plan view, and a cross-sectional view, respectively, of the lower connecting portion of the abutment assembly.

[0045] Referring to FIGS. 2, 3, and 6, the lower connecting portion (300) is combined with the holding portion (500) to connect the abutment (200) and the crown (400), and may be made of a metal material such as titanium, but is not limited thereto.

[0046] The lower connecting portion (300) and the holding screw (HS) are fastened to the abutment (200) while being coupled with the crown (400) (prosthesis assembly). The lower connecting portion (300) includes a first anti-rotation portion (310) and a second anti-rotation portion (320), and a first through hole (330) extending vertically is formed in the center of the lower connecting portion (300). The first anti-rotation portion (310) is coupled to a lower groove (410) of the crown (400), preferably to a coupling surface (412). At this time, the lower groove of the crown (400) includes a circular coupling surface (412) to which the first anti-rotation portion (310) is coupled, and a recess (412a) is formed on the coupling surface (412), and one or more protrusions (311) may be formed on the first anti-rotation portion (310).

[0047] The above protrusion (311) protrudes radially outward on the outer surface of the first anti-rotation part (310), and a recess (412a) corresponding to the protrusion (311) is formed on the joining surface (412), so that the lower connecting part (300) and the crown (400) can be recessed and joined to each other.

[0048] That is, the first anti-rotation portion (310) corresponds to the yoke (412a), and this protrusion (311) can be aligned with the flat portion (413) formed on the joining surface (412) of the crown (400).

[0049] Additionally, when the protrusion (311) is aligned and joined to the flat portion (413), relative rotation of the crown (400) with respect to the lower connecting portion (300) can be prevented.

[0050] Meanwhile, the second anti-rotation part (320) is inserted and supported in the second inner groove (240) of the abutment (200) and includes a lower extension part (321) and a second anti-rotation surface (322).

[0051] The lower extension portion (321) extends downward from the bottom surface of the first anti-rotation portion (310) and may have a circular cross-section. In an exemplary embodiment, a portion of the outer surface of the lower extension portion (321) may be formed in a tapered shape at an angle corresponding to the inner inclined portion (241).

[0052] The lower portion of the lower extension portion (321) may be formed in a polygonal shape corresponding to the polygonal portion (242) of the abutment (200). Specifically, a plurality of second rotation-preventing surfaces (322) may be formed in the lower portion of the lower extension portion (321) in a shape in which one side of the outer circumferential surface of the lower extension portion (321) is cut in a vertical direction.

[0053] That is, when the second rotational surface (322) is aligned and combined with the polygonal portion (242) of the abutment (200), relative rotation of the lower connecting portion (300) with respect to the abutment (200) can be prevented.

[0054] In an exemplary embodiment, the protrusion (311) of the first anti-rotation portion (310) may be formed to protrude perpendicularly toward the same direction as one of the second anti-rotation surfaces (322), and additionally, a separate mark (identification mark) may be displayed on the second anti-rotation surface (322) positioned in the same direction as the protrusion (311).

[0055] When the first rotation prevention part (310) of the lower connecting part (300) enters the lower groove (410) of the crown (400), the alignment between the protrusion (311) of the lower connecting part (300) and the flat part (413) of the crown (400) is not visually confirmed and may change during the entry process. At this time, if one surface (the surface with the identification mark) of the second rotation prevention surfaces (322) is formed in the same direction as the protrusion (311), it becomes possible to visually confirm the alignment between the first protrusion (311) and the flat part (413) of the crown (400) through one surface (the surface with the identification mark) of the rotation prevention surfaces (322).

[0056] The first through hole (330) may include an inner vertical portion (331) having a circular cross-section and a constant inner diameter from the upper surface entrance to a certain depth downward, and a boring portion (332) formed below the inner vertical portion (331) and having an inner diameter larger than the inner diameter of the inner vertical portion (331).

[0057] Additionally, a third inner peripheral screw portion (333) may be formed in the first through hole (330). The screw (600) may be temporarily fastened to the third inner peripheral screw portion (333) while passing through the first through hole (330).

[0058] Figures 7 (a) to (c) are a perspective view, a plan view, and a cross-sectional view, respectively, of a crown in an abutment assembly.

[0059] Referring to FIGS. 2, 3, and 7, a crown (400) forms the outer shape of an artificial tooth and can be custom-processed using a CAD or CAM system based on a registered library in a dental laboratory. The crown (400) may be made of zirconia, but is not limited thereto.

[0060] A lower groove (410) is formed at the bottom of the crown (400), and a second through hole (420) is formed in the center, which is connected to the lower groove (410) and extends vertically.

[0061] Specifically, the lower groove (410) may include an inclined support surface (411), a joining surface (412), and a flat surface (413). The inclined support surface (411) may have a circular cross-section and may be formed in a tapered shape in which the inner diameter becomes narrower from the bottom to the top of the lower groove (410).

[0062] The joining surface (412) is sunken upwards by a certain depth from the top of the inclined support surface (411) and can be formed in a cylindrical shape. The joining surface (412) faces the outer surface of the first anti-rotation part (310) of the lower connecting part (300).

[0063] In addition, the joining surface (412) may be formed with one or more flat portions (413) formed perpendicular to the radial direction of the lower groove (410). The flat portion (413) has a recess (412a) formed so that the protrusion (311) of the lower connecting portion (300) is caught and aligned, thereby preventing relative rotation of the crown (400) with respect to the lower connecting portion (300).

[0064] In addition, the second through hole (420) may be provided with a step portion (421) that protrudes radially inward. The support portion (510) of the upper connecting portion (500) may be hung and supported on the step portion (421). The upper surface of the step portion (421) may be formed as a sloped surface having a downward slope.

[0065] Figures 8 (a) to (c) are perspective views and cross-sectional views, respectively, of a holding screw in an abutment assembly.

[0066] Referring to FIGS. 2, 3 and 8, the holding screw (HS) largely includes a screw (600) and a holding portion (500).

[0067] First, the screw (600) passes through the second through hole (420) of the crown (400) and is coupled to the second inner peripheral screw portion (243) of the abutment (200). It may be made of a metal material such as titanium, but is not limited thereto. The screw (600) includes a head (610) and a body (620).

[0068] The head (610) may have a driver groove formed on its upper surface to allow a dental driver to be inserted and rotated. The driver groove has six grooves formed at regular intervals along the circumference of the inner wall of the head (610) so that a hexagonal dental driver can be inserted. However, this is not limited to this, and the number of grooves in the driver groove may be formed differently to correspond to a dental driver of a triangular, square, or pentagonal shape.

[0069] A tapered portion (611) may be formed at the bottom of the head (610). The tapered portion (611) is a portion connecting the head (610) and the body (620), and may be formed such that its diameter gradually decreases toward the bottom. When the screw (600) passes through the second through hole (420) of the crown (400) and is fastened to the second inner peripheral screw portion (243) of the abutment (200), the tapered portion (611) is supported by the mounting portion (511) of the holding portion (500).

[0070] At this time, as the screw (600) made of metal is supported by the fixing portion (511) of the holding portion (500) made of metal, the friction between them is improved, thereby preventing the screw (600) from loosening.

[0071] The body (620) has a cylindrical shape that extends lengthwise from the tapered portion (611), and a male screw portion (621) that is partially connected to the second inner screw portion (243) of the abutment (200) is formed on the outer surface.

[0072] Next, the holding part (500) is disposed at the lower portion of the head (600) and includes a support part (510) that is supported by being hung on the step part (421) of the crown (400) and a lower coupling part (520) that extends from the lower portion of the support part (510) and is coupled to the first through hole (330) of the lower coupling part (300).

[0073] At this time, the screw (600) and the holding part (500) may be formed integrally, but are not limited thereto.

[0074] That is, the holding part (500) can be detachably fastened to the screw (600) or manufactured as an integral structure.

[0075] In addition, the inner surface of the support member (500) is provided with a fourth inner surface screw portion (512) to which the screw (600)'s male screw portion (621) can be fastened, so that the holding member (500) can be fastened to the screw (600). In addition, the screw (600) may have a screw thread (not shown) formed at a position corresponding to the fourth inner surface screw portion (512).

[0076] Meanwhile, the holding portion (500) has a third through hole (530) extending vertically formed in the center, and includes a support portion (510) and a lower coupling portion (520). The upper coupling portion (500) may be made of a metal material such as titanium, but is not limited thereto.

[0077] The support portion (510) is formed in a cylindrical shape and is formed to have an outer diameter greater than the inner diameter of the step portion (421). A portion of the outer surface of the support portion (510) may be formed in a tapered shape corresponding to the inclined surface of the step portion (421).

[0078] The upper surface of the support member (510) may be provided with a mounting member (511) whose inner diameter becomes narrower as it goes downward. The mounting member (511) may support the head (610) of the screw (600), more specifically, the tapered portion (611) formed at the lower end of the head (610).

[0079] The lower joint (520) can be elastically deformed in the radial direction by including at least two joint pieces (521) separated by a vertical cut groove (522) formed from the support (510) to the lower end.

[0080] The cut grooves (522) may be formed so as to form an equal angle between adjacent lower cut grooves (522) along the circumference of the lower connecting portion (520). For example, the lower cut grooves (522) may be formed so as to form a 90-degree interval from each other based on the center of the third through hole (530), and thereby the lower connecting portion (520) may be formed to include a total of four connecting pieces (521). However, the number of lower cut grooves (522) is not limited thereto, and may be formed in various numbers as needed.

[0081] The lower coupling portion (520) can be fastened to the first through hole (330) of the lower coupling portion (300) by snap coupling. Specifically, the coupling piece (521) has a diameter corresponding to the inner vertical portion (331) of the first through hole (330). A catch (523) protruding radially outward can be formed at the end of the coupling piece (521). This catch (523) can induce snap coupling to the boring portion (332) of the lower coupling portion (300).

[0082] That is, the connecting piece (521) can be elastically contracted and deformed as the catch (523) comes into contact with the inner surface of the inner vertical portion (331) when inserted into the first through hole (330). Thereafter, when the insertion of the connecting piece (521) into the first through hole (330) is completed, the catch (523) can be elastically restored as it passes through the inner vertical portion (331) and settles into the boring portion (332).

[0083] In an exemplary embodiment, the coupling piece (521) of the lower coupling portion (520) can be expanded outward by the body (620) of the screw (600) when the screw (600) is inserted into the second through hole (530) and can be brought into close contact with the inner vertical portion (331). Accordingly, the coupling between the lower coupling portion (300) and the holding portion (500) can be made more firmly.

[0084] In this way, the holding portion (500) can provide a sense of fastening to the user by being snap-connected to the lower connecting portion (300), and thereby the crown (400) can be detachably fastened to the abutment (200). That is, the fastening of the crown (400) and the abutment (200) is possible without using cement, thereby preventing the crown (400) from being displaced from its original position due to gum repulsion.

[0085] In addition, the lower connecting portion (300) and the holding portion (500) reproduce a fluidity almost similar to the movement of natural teeth through elastic deformation when an external force is applied, thereby absorbing and dispersing the external force, thereby alleviating the impact applied to the alveolar bone during repetitive chewing, and simultaneously implementing the role of a periodontal ligament.

[0086] FIG. 9 is an exploded perspective view of an abutment assembly assembly system according to one embodiment of the present invention, FIGS. 10 and 11 are drawings showing a process of assembling a prosthesis assembly using the abutment assembly assembly system, and FIG. 12 is a drawing showing a process of assembling a prosthesis assembly to an abutment connected to an implant.

[0087] Hereinafter, with reference to FIGS. 9 to 12, the process of assembling a prosthesis assembly (lower connecting part, crown, holding screw) using an abutment assembly assembly system and the process of assembling an abutment assembly (1000) of the present invention will be described in detail.

[0088] First, the abutment assembly (1000) of the present invention can be assembled by an abutment assembly assembly system (A), and the abutment assembly assembly system (A) can include both the abutment assembly (1000) and a tool and jig (or TOOL) for assembling the same.

[0089] That is, the abutment assembly assembly system (A) may include a driver (10) and a jig (2) in addition to the abutment assembly (1000).

[0090] The above driver (10) is a tool for fastening a holding screw (HS), and the above jig (2) is a part that provides an assembly space for fixing and assembling a prosthesis assembly.

[0091] First, in performing a basic implant procedure, a process of inserting an abutment (200) into an implant (100) implanted in the alveolar bone and fixing the abutment (200) to the implant (100) is performed.

[0092] Next, as shown in FIGS. 10 and 11, a process of assembling the prosthesis assembly is performed.

[0093] The process of assembling the prosthesis assembly involves positioning the lower connecting part (300) in the correct position and joining it to the jig (2). At this time, a polygonal groove is formed in the jig (2) to correspond to the second rotation-proof surface (322) of the lower connecting part (300), so that the lower connecting part (300) can be fixedly secured without rotating.

[0094] Next, the crown (400) is inserted while the lower connecting part (300) is inserted into the jig (2).

[0095] Next, insert the holding screw (HS) into the second through hole (420) of the crown (400), and then use a driver (1) to screw the holding screw (HS) into the thread formed inside the jig (2).

[0096] Accordingly, when the holding screw (HS) is screwed into the thread of the jig (2), the lower connecting portion (520) of the holding portion (500) is caught in the boring portion (332) of the lower connecting portion (300), and the holding portion (500) and the lower connecting portion (300) are connected, so that the lower connecting portion (300) and the holding screw (HS) are connected and assembled inside the crown (400).

[0097] In this way, the process of assembling the prosthesis assembly is performed using a driver (1) and a jig (2) without individually assembling the prosthesis parts directly to the abutment (200) installed in the alveolar bone.

[0098] In this way, when the prosthesis assembly is completed, the holding screw (HS) is separated from the jig (2) using the driver (1) to separate the prosthesis assembly. At this time, even if the holding screw (HS) is separated from the jig through thread connection, the crown (400), the lower connecting portion (300), and the holding screw (HS) can remain connected without being separated from each other, and can only be separated from the jig (2).

[0099] Next, a process of installing the assembled prosthesis assembly into the abutment (200) installed in the alveolar bone is performed.

[0100] First, in the assembled prosthesis assembly, the lower connecting part (300) is inserted into the abutment (200) by aligning the second rotation-preventing surface (322) of the second rotation-preventing part (320) and the polygonal part (242) of the abutment (200), thereby completing the temporary connection of the crown (400) and the abutment (200).

[0101] Thereafter, when the screw thread (621) of the screw (600) is fastened to the second inner surface screw thread (243) of the abutment (200) using the driver (1), the tapered portion (611) of the screw (600) is supported by the mounting portion (521) of the upper connecting portion (500), and thus the connection between the lower connecting portion (300), the holding portion (500), and the crown (400) becomes more solid.

[0102] In this way, according to the abutment assembly (1000) of the present invention, the crown (400) can be firmly connected to the abutment (200) without dental cement due to the joint structure between the implant (100), the abutment (200), the lower connecting portion (300), the crown (400), and the holding screw (HS), thereby eliminating inflammation caused by the dental cement.

[0103] According to the abutment assembly according to the technical idea of ​​the present invention, it has the advantage of being able to have long-term stability by being able to assemble quickly and accurately so as to minimize deformation of the prosthesis and parts without dental cement, and it has the advantage of being able to eliminate inflammation caused by dental cement.

[0104] As described above, the best practice embodiments have been disclosed in the drawings and specifications. While specific terms have been used herein, they are used solely for the purpose of describing the present invention and are not intended to limit the meaning or scope of the invention as defined in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent embodiments are possible. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

[0105] The present invention is implemented as an abutment assembly that can be precisely assembled to minimize deformation of a prosthesis and parts, and that enables a strong bonding of a crown and an abutment without using dental cement, but can be applied to various industrial fields within the scope of the configuration of the present invention.

Claims

1. An implant that is implanted into the alveolar bone and has a first internal groove with a first inner peripheral screw portion formed therein; An abutment having a second internal groove formed in the center with a second internal screw portion, and inserted into and joined to the first internal groove; A lower connecting portion having a first through hole extending vertically in the center and coupled to the second inner groove; A crown having a second through hole extending vertically in the center and a lower groove provided below the second through hole to which the lower connecting part is joined; and An abutment assembly including a holding screw, which is inserted into the second through hole and coupled to the lower connecting portion, and has a male screw portion formed therein that is fastened to the second inner peripheral screw portion of the abutment.

2. In paragraph 1, The above lower connection part is, An abutment assembly characterized by including a first anti-rotation part inserted into a lower groove of the crown and a second anti-rotation part inserted into a second inner groove of the abutment.

3. In paragraph 2, The lower groove of the above crown is The first anti-rotation part comprises a circular joint surface to which it is joined, and a groove is formed on the joint surface. The above first anti-rotation part is, An abutment assembly characterized by including a protrusion corresponding to the above-mentioned portion.

4. In paragraph 2, An abutment assembly, characterized in that the cross-section of the second anti-rotation portion is formed in a polygonal shape, and the second internal groove includes a polygonal portion corresponding to the second anti-rotation portion.

5. In paragraph 1, An abutment assembly characterized in that the first through hole of the lower connecting portion has a third inner peripheral threaded portion to which the male threaded portion of the holding screw can be fastened.

6. In paragraph 1, The second through hole of the above crown is provided with a step portion, The above holding screw, A screw having a head formed at the upper portion and a male threaded portion formed at the lower portion to be fastened to a first inner surface screw portion; and An abutment assembly characterized by comprising: a holding part including a support part positioned at the lower portion of the head and supported by being hung on the protrusion of the crown; and a lower connecting part extending from the lower portion of the support part and connected to the first through hole of the lower connecting part.

7. In paragraph 6, An abutment assembly characterized in that the screw and the holding portion are formed integrally.

8. In paragraph 6, An abutment assembly characterized in that the inner surface of the support portion has a fourth inner surface screw portion to which the male screw portion of the holding screw can be fastened, and the holding portion can be fastened to the screw.

9. In paragraph 6, The above lower joint portion includes a joint piece that is elastically deformable in the radial direction and is separated by a cut groove, A stumbling block is formed on the outer surface of the above-mentioned joint, The first through hole of the lower connecting portion is formed with an inner vertical portion having a constant inner diameter, and a boring portion provided below the inner vertical portion and to which the catch is coupled. An abutment assembly characterized in that the above-mentioned joining piece is contracted radially inwardly while passing through the inner vertical portion and expanded radially outwardly in the boring portion to be elastically joined to the inner peripheral surface of the first through hole.

10. In paragraph 6, The above lower joint is formed with a circular cross-section, An abutment assembly, characterized in that the lower connecting portion is inserted into the first through hole of the lower connecting portion and the outer surface thereof is in close contact with the inner surface of the first through hole.

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